jdbcdatabasemetadata.java

一个用java写的开源的数据库系统

     *
     * HSQLDB supports table correlation names; this method always
     * returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsTableCorrelationNames() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether, when table correlation names are supported, they
     * are restricted to being different from the names of the tables. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB requires that table correlation names are different from the
     * names of the tables; this method always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsDifferentTableCorrelationNames()
    throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether this database supports expressions in
     * <code>ORDER BY</code> lists. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB supports expressions in <code>ORDER BY</code> lists; this
     * method always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsExpressionsInOrderBy() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether this database supports using a column that is
     * not in the <code>SELECT</code> statement in an
     * <code>ORDER BY</code> clause. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB supports using a column that is not in the <code>SELECT</code>
     * statement in an <code>ORDER BY</code> clause; this method always
     * returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsOrderByUnrelated() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether this database supports some form of
     * <code>GROUP BY</code> clause. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB supports using the <code>GROUP BY</code> clause; this method
     * always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsGroupBy() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether this database supports using a column that is
     * not in the <code>SELECT</code> statement in a
     * <code>GROUP BY</code> clause. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB supports using a column that is
     * not in the <code>SELECT</code> statement in a
     * <code>GROUP BY</code> clause; this method
     * always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsGroupByUnrelated() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether this database supports using columns not included in
     * the <code>SELECT</code> statement in a <code>GROUP BY</code> clause
     * provided that all of the columns in the <code>SELECT</code> statement
     * are included in the <code>GROUP BY</code> clause. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB supports using columns not included in
     * the <code>SELECT</code> statement in a <code>GROUP BY</code> clause
     * provided that all of the columns in the <code>SELECT</code> statement
     * are included in the <code>GROUP BY</code> clause; this method
     * always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsGroupByBeyondSelect() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether this database supports specifying a
     * <code>LIKE</code> escape clause. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB supports specifying a
     * <code>LIKE</code> escape clause; this method
     * always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsLikeEscapeClause() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether this database supports getting multiple
     * <code>ResultSet</code> objects from a single call to the
     * method <code>execute</code>. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * Up to and including 1.7.1, HSQLDB does not support getting multiple
     * <code>ResultSet</code> objects from a single call to the
     * method <code>execute</code>; this method
     * always returns <code>false</code>. <p>
     *
     * This behaviour <i>may</i> change in a future release.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsMultipleResultSets() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database allows having multiple
     * transactions open at once (on different connections). <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB allows having multiple
     * transactions open at once (on different connections); this method
     * always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsMultipleTransactions() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether columns in this database may be defined as
     * non-nullable. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * HSQLDB supports the specification of non-nullable columns; this method
     * always returns <code>true</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsNonNullableColumns() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return true;
    }

    /**
     * Retrieves whether this database supports the ODBC Minimum SQL grammar. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * up to and including 1.7.1, HSQLDB does not support the ODBC
     * Minimum SQL grammar; this method
     * always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsMinimumSQLGrammar() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database supports the ODBC Core SQL grammar. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * up to and including 1.7.1, HSQLDB does not support the ODBC
     * Core SQL grammar; this method
     * always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsCoreSQLGrammar() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database supports the ODBC Extended SQL grammar. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * up to and including 1.7.1, HSQLDB does not support the ODBC
     * Extended SQL grammar; this method
     * always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *
     *
     * @return <code>true</code> if so; <code>false</code> otherwise
     * @exception SQLException if a database access error occurs
     */
    public boolean supportsExtendedSQLGrammar() throws SQLException {

        if (Trace.TRACE) {
            Trace.trace();
        }

        return false;
    }

    /**
     * Retrieves whether this database supports the ANSI92 entry level SQL
     * grammar. <p>
     *
     * <!-- start release-specific documentation -->
     * <span class="ReleaseSpecificDocumentation">
     * <b>HSQLDB-Specific Information:</b> <p>
     *
     * up to and including 1.7.1, HSQLDB does not support the ANSI92 entry
     * level SQL grammar; this method
     * always returns <code>false</code>.
     * </span>
     * <!-- end release-specific documentation -->
     *